Professions are skills used to create and enhance items (gears). You will start with one skill once your character has learned a profession. When you use the profession, your skill will increase. A profession’s higher skill will allow you to create more powerful items. If you change a primary profession, you will lose any skill you have made with your original profession. So it is important to choose your primary professions wisely.
The world quests aren’t necessarily bad, but they aren’t good either. I wouldn’t mind killing five of a type of monster or fighting one particular boss a few times, but after seven or eight, it starts to wear pretty thin. But going from levels in the mid-20s can take nearly 30,000 AP, so you’ll need more than world quests if you want to get your heart up in a reasonable time.
If you're a new player and buying gold (for some startup money) isn't an option, there's nothing wrong with gathering (especially if you're getting BfA...it'll be good gold initially if you farm BfA mats and sell high). You can make pretty good money just flipping stuff...and because Legion items are super risky now, it's a good time to get spirits of harmony (just buy what you can and sell it in in bigger stacks at higher costs or turn it into ore/bars or lotus to sell when that is profitable). I'd avoid putting all of your gold there though. Sometimes a bot or just someone returning to the game will dump 10+ stacks of 200 spirits cheap and tanks the markets for a bit. Flipping (if you get good at it) will make you more gold in than long run than farming but if you don't have much gold either is a step forward from here. They key to making gold is having the flexibility to lock up most of your gold in items and wait patiently to sell them at a good price but you gotta start small (or cheat like me...when I came back in December I just spent $100 on tokens and haven't spent money on anything other than the Collector's edition since. It's a lot easier to make gold if you already have some.
Also, all of this mobs in this area are humanoid. This means additional cloth drops for gold. So, you want to do this farm with a character which has Tailoring. Because if you have Tailoring, more clothes will drop thanks to Cloth Scavenging. This is real good because materials are going for good prices in this days. Another advantage of having Tailoring is Resilient Spellthread. It prevents you from being dazed in Kul Tiras and Zandalar.
Tbh high prices of enchants / gems / flasks / augment runes / food buffs are mostly an opportunity for casuals to make gold. Majority of them don't use these for themselves. How often do you do casual content and see casual players use flasks, gem and enchant their gear? I rarely do. It's common to pug a normal raid or similar content and see people ungemmed / unenchanted and using no consumables unless someone drops down a feast. It's simply not necessary and not required in casual content and people don't bother. Not even mentioning more casual levels like lfr and open world content.
All I know is that Scribes are going to make bank with those Contracts. All guides talks about them and everyone will want them. Better ride that money wave while we can. Other than that, Alchemy and Jewelcrafting are always safe bets with tradable and marketable goods. Engineers can get an item for followers to bring back more Azerite, ot sure how much of a headstart that's gonna give them. The rest of the professions honestly looks kinda lame since most of everything is BoP anyway.
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There's a few profession crafted pets in BfA on the horizon - Battle for Azeroth Tailoring is getting a Hot Air Balloon style pet, and BfA Alchemy looks to be getting a brand new Transmute Meat to Pet. There are some mount buff consumables from both BfA Leatherworking in the form of a mount barding, and Blacksmithing in Battle for Azeroth will be able to craft Stirrups and Hoofplates to increase mount speed and allow you to interact with things while mounted.